<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <style>
            .removeLi {
                list-style: none;
            }
            .fon {
                list-style: none;
                font-size: 22px;
            }
        </style>
    </head>
    <body>
        <div id="app">
            <li
                v-for="(item,index) in list"
                :class="removeLi"
                :key="index"
                @click="handleChangFontSize(index)"
            >
                {{item}}
            </li>
        </div>
        <script src="../vue.js"></script>
        <script>
            new Vue({
                el: '#app',
                data() {
                    return {
                        list: [1, 2, 3],
                        removeLi: 'removeLi',
                    };
                },
                methods: {
                    handleChangFontSize(index) {
                        this.removeLi = 'fon';
                        console.log(index);
                    },
                },
            });
        </script>
    </body>
</html>
